OpenGL里画线

xShandow

<>在OpenGL里画线语句:
glBegin(GL_LINES);
   glVertex2f(x,y);
   glVertex2f(a,b);
) r/ Y9 i. H5 N) L! ^+ w& Z/ b; mglEnd();</P>
- h6 ?& E) u, m1 @& r<>注意:目前只讨论OpenGL 2D模式.

0 [" x  |7 @* o% P5 [& A下面是一个画线实例和效果图
#define GL_PI 3.1415f</P>
<>void Draw()
{
) B$ s% J/ h+ L& t" I/ D2 I GLfloat x,y,angle;</P>
# \: E8 n0 [- m* v. _9 [9 _<> glPushMatrix();</P>
' D, {' h! x" X2 e; x<> glTranslatef(300,200,0);
& Z  s8 V3 g, H1 p glColor3f(0.6f,0.6f,0.1f);
" c6 p* F1 e  O  }% c7 [ glBegin(GL_LINES);
, j0 @  j* \: I7 S. L: c  for(angle=0.0f;angle&lt;3*GL_PI;angle+=0.5f)
- `2 T5 j( T8 b' ?9 z  {
   x=150.0f*sin(angle);
7 Q  Z' {* B* E$ o   y=150.0f*cos(angle);</P>
+ F$ A$ d$ g+ s/ v8 I% V9 H! J% Z<>   glVertex2f(x,y);</P>
1 _0 I  s4 s; B! i. V7 Y  ?<>   x=150.0f*sin(angle+3.1415f);
/ ~- g# ~$ T1 q/ N% \( W% F   y=150.0f*cos(angle+3.1415f);
   glVertex2f(x,y);
  }
  
glEnd();</P>
<> glPopMatrix();
}
</P>